18 Series: 1/8 NPT Ported 2, 3 & 4 Way 2 Position Valves feature short stroke, light weight Delrin® spools providing fast, positive and reliable response. Operation to 150 psi. Suitable for Vacuum directional flow but NOT for Holding Vacuum.Features: Aluminum Bar Body • Anodized Black•Honed & Roller Burnished Bore•Pressure Balanced Delrin Spool •Buna-N Seals •Prelubed with Magnalube-G® Grease • Interchangeability of Parts • Operating Temperature +32 ° to +180° F •Cv = 0.27/ 14.2 SCFM Free Flow to Atmosphere at 80 psi Supply